How can you tell which quadrant the resultant force is in? balance (that is, the resultant is zero, or what is the same, there is no resultant). Keep in mind that if the polygon is closed, it is because the system is in equilibrium. System of collinear forces (variant of the concurrent ones): which are those forces with coincident line of action. When is a system of collinear forces in equilibrium? When a body is subjected to a system of forces such that the resultant of all forces and the resultant moment are zero, then the body is in equilibrium. What are the conditions for a system of forces to be in equilibrium? ∑M8= 0 The first states that the algebraic sum of the forces is zero and the second that the algebraic sum of the moments about any point (not on the line of action) is zero (0). What are the conditions for a system of concurrent forces to be in equilibrium?Įquilibrium conditions for concurrent forces. Example of concurrent and coplanar forces. Parallel forces: All those that have the same direction (although they may have different meanings) than a certain unit vector. Coplanar forces: Those that are contained in the same plane.
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